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Problem 7 Water volume increases by 1/9 when it is frozen. How does ice volume decrease when ice is melted?.

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Answer Let us suppose that the volume of water is equal to 1. When it is frozen we get the volume of ice 1+1/9=10/9 From the ice with volume 10/9 we receive water with volume 1. This means that ice is decreased by 1/9:10/9=1/10 of its volume.

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Problem 8 Ann has 2/3 meters of a rope. How she can cut ½ meters if she does not have a ruler?

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Answer Ann can bent a rope twice and measure 1/6m. Than she can cut 1/6m from 2/3m and get ½m (2/3-1/6=1/2)

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Problem 9 Find the rule and exclude one number 1/31/823/7 4/111/3 0.1255/134/11

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